A hand gesture made when only your pinky and ring finger are put down. It resembles the gun you made when pretending to be a cop as a child. Usually put up in order to be the first chosen to answer a question, even though a person who uses glingers shout out anyways. Someone who uses glingers is usually an annoyance to the teacher and the class.

Teacher: What is the square root of 9?
Annoying Student C.B. (puts up glingers): That would be the number 3!
*The rest of the class rolls their eyes.*